Estimation is to predict the outcome of seismic load to underground pipeline with manholes. Forces and shears were taken into account during modelling of seismic resistance. There were 3 types of waves identified in this job, and the estimation of the maximum velocity of the soil movement was made according to the category of soil by seismic properties. The seismic resistance was estimated under the action of both horizontal and vertical directions of seismic load. The model of a manhole was created from scratch by authors. The main supporting elements of the body were modelled in a stress-deformed mode. The transmission of seismic longitudinal P-waves was simulated with parameters up to 9 points inclusive at the MSK-64 scale in soils of medium density. Based on the analysis of the data obtained, a graph of maximum equivalent von Mises stresses was built depending on the phase of the seismic longitudinal P-wave transmission. Conclusions were made about the efficient usage of applying the proposed approach to solve this class of problems.
In the process of transporting the tank to the place of operation, as well as during installation and repair work, the formation of mechanical defects on the body, such as a “dent”, of various sizes, shapes and locations relative to structural elements and technological fittings is possible. Defects of this type are stress concentrators, which may be the key to premature equipment failure due to its failure. The current regulatory documentation in the field of assessing the technical condition and strength analysis of capacitive equipment has established the necessary set of work to assess the negative impact of defects such as a “dent” on the normal operation of the vessel. However, in most cases, normative documents presuppose types of work aimed directly at identifying the geometrical dimensions of the dent and conducting non-destructive testing of the areas closest to it in order to identify unacceptable defects and unacceptable thinning zones, as well as strength calculation with a defect. According to these parameters, the so-called “admissibility” or “inadmissibility” of the detected dent is evaluated. In this paper, we study the relationship between the impact of a dent with certain geometric dimensions on the body of the technological tank on its stress-deformed state, considering the location of the technological fittings, and constructive solutions are developed to reduce the numerical values of maximum stresses.
The operation of devices with a shirt is carried out at high pressures and temperatures in corrosive environments. This is a prerequisite for the development of such a damage mechanism as a decrease in wall thickness and loss of strength. For a quantitative assessment of the degree of corrosion wear and prediction of the further period of safe operation of the apparatus, standard methods and techniques are used, which are indicated in the current regulatory and technical documentation for diagnosing and evaluating the resource. For apparatuses with a shirt, access to a complete 100% inspection of the inner surface of both the main apparatus and the shirt is difficult due to the design features and the absence of a hatch of sufficient diameter. In this regard, a large error in the qualitative assessment of the technical condition and resource forecasting is possible. Currently relevant is the work on modeling apparatuses and assessing the stress-deformed state, taking into account their design and operational features, taking into account changes in the parameters of the technical condition, such as corrosion wear, and identifying the most loaded zones and areas with a view to their furthermore detailed diagnosis. In this paper, we study the interconnection between the effects of operational loads and corrosion wear, both of the apparatus itself and the shirt on the stress-deformed state of the apparatus as a whole.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.